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Abstract:

Raman spectra of aqueous solutions of hydrogen sulfite ion (SHO3-) were collected over temperatures of 275 to 340 K. The change in peak intensities with temperature was used to assign peaks to the hydrogen sulfite isomers. The HOSO2- isomer
has a peak at 1023 cm−1 and the HSO3- isomer has a peak at 1052 cm−1. The relative strengths of the peaks were determined and used to measure the equilibrium quotients for hydrogen sulfite ion.

Q1 = [HOSO2-]/[HSO3-]

Q2
= [S2O52-]/SHO3-]2

No evidence was found for a hydrogen sulfite dimer other than disulfite ion, S2O52-.

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